Low-soluble cement



Q-SfPaiemed June 27, 1933 COATING QR PLASTIC.-

* UNITED EUGENE L. cHArrELL, E PITTSBURGH, PENNSYLVANIA, Ass IeNoR. 'ro NATIONAL No Drawing.

capable of application to the interior of a pipe to form a homogeneous.coatingfi An other object is to provide a pipe having a low-soluble cement lining or coatingg 'i- In detail; the invention is a cement consisting of gortland cement and cupola slag 20 the cemen pre era y comprising a ou v TUBE comm, A CORPORATION on NEW JERSEY Eow-soLUBLE CEMENT Applicat icn filed dctober 27, 1931. Serial No. 571,455.

.gfacture, are entirely different. Cupola slag fls produced in such small amounts by even large steel plants that it is ordinarily conn sidered impractical to use it in cement manfufacture. Cement for the use for which the '3 present one is intended need not, however,

be manufacturedin excessively large quantities, and the use of cupola slag consequently becomes practical.

- The chemical constituents of typical so per cent. and the slag about 66 percent. on ola sla are substantially as follows: of the mixture. This mixture is ground to I Percent I have a maximum fineness of a'15 percent. C l iu oxid 23 -30 deposit on a two hundred mesh sieve. This M g ium xid .7- 2

degree of fineness will produce a cement of Ferric oxid t 4 -16 suificiently low solubility for use in lining Alu inum oxid ;i 6 -12 pipes. It is not, however,sufliciently sticky Silica 45 54 to certainly adhere to a vertical pipes interio'r when blown or sucked therethrough. yp blast furnace Siege a much By grinding the previously described g e Percentage of calcmm 0x101 and a 58 mixture so fine that only 20 per cent. of it has a diameter greater than 22 microns, it is impossible to grade this small degree of fineness by reference to the standard 200 much lower percentage of silica and ferric oxidthan do cupola slagsK Although a specific example of the invention has been disclosed in accordance with 25 mesh sieve test, the cement is sufliciently P Patent Statutes, it is not intended to 7- adhere t the pipe even thou h i 1t 1138 scope exactly thereto, except as defined a vertical position. The cement, when the mill where they may be positioned horizontally and, when ground to the second named fineness, the cement is suitable for coating pipes already installed in buildings by being blown or sucked therethrough as suggested.

- to 54 per cent. silica.

v by the appended claim ground t th i fi t' named fineness, may be used to coat pipesj I claim: i

A low soluble cement consisting of a mixture of substantially 33 per cent. Portland cement and 66 per cent, cupola slag, said slag substantially consisting of from 23 to 30 per cent. calcium oxid, 4 to 16 per cent. ferric oxid, 6 to 12 per cent. aluminum oxid and Now it must be thoroughly understoo d In testimony whereof, I have hereunto set u that cupola slag and blast furnace slag, the my hand. FY latter being frequently used in cement manu- I L. CHAPPELL. 

